diff --git a/client/scripts/npc/move_applier.gd b/client/scripts/npc/move_applier.gd
new file mode 100644
index 0000000..1aeaa0c
--- /dev/null
+++ b/client/scripts/npc/move_applier.gd
@@ -0,0 +1,37 @@
+class_name MoveApplier
+extends RefCounted
+## Writes validated §6 moves to game state. Town-NPC disposition lives in
+## GameState.npc_dispositions (NOT CanonLog.party — that is companions only).
+## Called by the conversation caller after NpcService.speak, so state writes
+## stay explicit (§2). Unknown move names are ignored (they never pass the
+## validator, but this stays defensive).
+
+const MAX_DELTA := 15       # one line cannot swing standing wholesale (§7 spirit)
+const HOSTILE_FLOOR := -100
+
+
+static func apply(moves: Array, game_state, canon_log, content_db, npc_id: String) -> void:
+	for move in moves:
+		var name: String = move.get("name", "")
+		var args: Array = move.get("args", [])
+		match name:
+			"offer_quest":
+				var q: String = str(args[0])
+				var qd: Dictionary = content_db.quest(q)
+				canon_log.add_quest(q, qd.get("name", ""), qd.get("objective", ""))
+			"reveal":
+				game_state.mark_revealed(str(args[0]))
+			"give_item":
+				var i: String = str(args[0])
+				game_state.add_item(i, 1)
+				game_state.mark_gift_given(i)
+			"accept_item":
+				game_state.remove_item(str(args[0]), 1)
+			"adjust_disposition":
+				var delta: int = clampi(int(str(args[0])), -MAX_DELTA, MAX_DELTA)
+				var cur: int = int(game_state.npc_dispositions.get(npc_id, 0))
+				game_state.set_npc_disposition(npc_id, cur + delta)
+			"become_hostile":
+				game_state.set_npc_disposition(npc_id, HOSTILE_FLOOR)
+			_:
+				pass  # refuse, end_conversation, and anything unknown: no state
diff --git a/client/tests/unit/test_move_applier.gd b/client/tests/unit/test_move_applier.gd
new file mode 100644
index 0000000..2a653c9
--- /dev/null
+++ b/client/tests/unit/test_move_applier.gd
@@ -0,0 +1,55 @@
+# client/tests/unit/test_move_applier.gd
+extends "res://addons/gut/test.gd"
+
+const MoveApplier = preload("res://scripts/npc/move_applier.gd")
+const ContentDB = preload("res://scripts/content/content_db.gd")
+
+
+func _m(name, args := []) -> Dictionary:
+	return {"name": name, "args": args}
+
+
+func _content() -> ContentDB:
+	var c = ContentDB.new()
+	c.quests = {"find_the_ledger": {"id": "find_the_ledger",
+		"name": "The Missing Ledger", "objective": "Find who took it"}}
+	return c
+
+
+func test_offer_quest_adds_active_quest():
+	var log = CanonLog.new()
+	MoveApplier.apply([_m("offer_quest", ["find_the_ledger"])],
+		GameState.new(), log, _content(), "fenn")
+	assert_true(log.has_quest("find_the_ledger"))
+	assert_eq(log.active_quests[0].name, "The Missing Ledger")
+
+
+func test_reveal_marks_topic():
+	var gs = GameState.new()
+	MoveApplier.apply([_m("reveal", ["varrell_twins"])], gs, CanonLog.new(), _content(), "fenn")
+	assert_true(gs.is_revealed("varrell_twins"))
+
+
+func test_adjust_disposition_clamps_to_max_delta():
+	var gs = GameState.new()
+	MoveApplier.apply([_m("adjust_disposition", ["+50"])], gs, CanonLog.new(), _content(), "fenn")
+	assert_eq(gs.npc_dispositions.get("fenn", 0), MoveApplier.MAX_DELTA)
+
+
+func test_become_hostile_sets_floor():
+	var gs = GameState.new()
+	MoveApplier.apply([_m("become_hostile")], gs, CanonLog.new(), _content(), "fenn")
+	assert_eq(gs.npc_dispositions.get("fenn", 0), MoveApplier.HOSTILE_FLOOR)
+
+
+func test_accept_item_removes_from_inventory():
+	var gs = GameState.new()
+	gs.add_item("coin", 2)
+	MoveApplier.apply([_m("accept_item", ["coin"])], gs, CanonLog.new(), _content(), "fenn")
+	assert_eq(gs.inventory.get("coin", 0), 1)
+
+
+func test_refuse_and_end_are_noops():
+	var gs = GameState.new()
+	MoveApplier.apply([_m("refuse"), _m("end_conversation")], gs, CanonLog.new(), _content(), "fenn")
+	assert_eq(gs.npc_dispositions.size(), 0)